A basic slow-release material, a method for preparing the same and a method for treating acidic wastewater
By using a slow-release material composed of mixed magnesium oxide powder, dolomite powder, etc., a surface gel layer is formed to encapsulate alkaline particles, controlling the alkali release rate. This solves the problem of easy passivation and failure of existing alkaline slow-release materials, and achieves efficient and low-cost treatment of acidic wastewater.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING MINING & METALLURGICAL TECH GRP CO LTD
- Filing Date
- 2026-06-08
- Publication Date
- 2026-07-17
AI Technical Summary
Existing alkaline slow-release materials dissolve too quickly, are prone to passivation and failure, and have limited functionality. They also suffer from problems such as difficulty in balancing slow-release performance and reactivity, poor resistance to passivation, lack of simultaneous purification function, high environmental impact of preparation process, low wastewater treatment efficiency, and high treatment cost.
The method employs a uniformly mixed first and second slow-release material. The first slow-release material consists of magnesium oxide powder, dolomite powder, and water glass, while the second slow-release material consists of lime powder, gypsum powder, sodium alginate, carboxymethyl chitosan, carboxymethyl cellulose, and calcium chloride. Through extrusion granulation and drying, a surface gel layer is formed to coat the alkaline particles, thereby controlling the release rate of alkali and achieving precise slow release and long-lasting neutralization performance.
It achieves stable pH levels in treated acidic wastewater, boasts high treatment efficiency and low cost, can operate stably for more than 3 months, is easy to operate, and uses readily available raw materials.
Smart Images
Figure CN122403604A_ABST